Closed jfr Java source contains code which generates a warning if -Xlint:try is used in the compile. This prevent -Xlint:try from being used to compile all of the Java sources in the jdk open and closed repos.
JDK-8024603Turn on javac lint checking for auxiliaryclass, empty, and try in jdk build
JDK-8024600[macosx] code prevents use of -Xlint:auxiliaryclass,empty in jdk build
JDK-8024601Windows networking code prevents use of -Xlint:auxiliaryclass in jdk build